Preparation method and application of bi-metal cyanide catalyst

A double metal cyanide and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low carbon dioxide insertion and low catalyst activity, and achieve wide pore size distribution and activity. improved effect

Active Publication Date: 2013-12-11
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Most of the existing patents use the co-precipitation method to prepare double metal cyanide catalysts for the preparation of polypropylene carbonate polyols, which have the problems of low catalyst activity and low carbon dioxide insertion in the product

Method used

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  • Preparation method and application of bi-metal cyanide catalyst
  • Preparation method and application of bi-metal cyanide catalyst
  • Preparation method and application of bi-metal cyanide catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0060] Weigh 10g of potassium hexacyanocobaltate(III) into a 250mL three-necked flask, add 50mL of deionized water, 90mL of TritonX-100, 50mL of tert-butanol, and 60mL of cyclohexane, and stir for 2 hours at 2000r / min to obtain Uniform and transparent microemulsion. Weigh 40g ZnCl 2 In a 1L three-neck flask, add 100mL of deionized water, 180mL of TritonX-100, 100mL of tert-butanol and 120mL of cyclohexane, and stir at 2000r / min for 2h to obtain a uniform microemulsion. Transfer the potassium hexacyanocobaltate(III) microemulsion to a 300mL separatory funnel, and add it dropwise to the ZnCl 2 In the microemulsion, the temperature was controlled at 30°C. After the dropwise addition was completed, stirring was continued for 2 h. By measurement, the average particle diameter of the emulsion after mixing is 15nm. The resulting solution was demulsified and centrifuged under the condition of 9000r / min, the precipitate was put into a 1L three-necked flask, a mixed solution of 200m...

Embodiment 2

[0062] Weigh 10g of potassium hexacyanoferrate(Ⅲ) into a 250mL three-neck flask, add 50mL of deionized water, 90mL of tetrabutylphosphine bromide, 50mL of ethylene glycol monomethyl ether, and 60mL of dimethyl ether, Stir for 2 hours under the same conditions to obtain a uniform and transparent microemulsion. Weigh 40g of zinc sulfate into a 1L three-neck flask, add 100mL of deionized water, 180mL of tetrabutylphosphine bromide, 100mL of dimethyl ether and 120mL of ethylene glycol monomethyl ether, and stir for 2 hours under the condition of 2000r / min to obtain a uniform Microemulsion. Transfer the potassium hexacyanoferrate (III) microemulsion to a 300mL separatory funnel, and add it dropwise into the zinc sulfate microemulsion under the stirring condition of 2000r / min, and the temperature is controlled at 30°C. After the dropwise addition was completed, stirring was continued for 2 h. By measurement, the average particle diameter of the emulsion after mixing is 16nm. The ...

Embodiment 3

[0064] Weigh 10g of potassium hexacyanocobaltate (Ⅲ) into a 250mL three-neck flask, add 50mL of deionized water, 90mL of lecithin, 50mL of dimethyl ether, and 60mL of petroleum ether, and stir for 2 hours at 2000r / min to obtain a uniform Microemulsion. Weigh 40g ZnBr 2 In a 1L three-neck flask, add 100mL of deionized water, 180mL of lecithin, 100mL of dimethyl ether and 120mL of petroleum ether, and stir at 2000r / min for 2h to obtain a uniform microemulsion. Transfer the potassium hexacyanocobaltate (Ⅲ) microemulsion to a 300mL separatory funnel, and add it dropwise to the ZnBr under the stirring condition of 2000r / min. 2In the microemulsion, the temperature was controlled at 30°C. After the dropwise addition was completed, stirring was continued for 2 h. By measurement, the average particle diameter of the emulsion is 16nm. The resulting solution was demulsified and centrifuged under the condition of 9000r / min, the precipitate was put into a 1L three-necked flask, a mixed...

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Abstract

The invention discloses a preparation method of a bi-metal cyanide catalyst, which comprises the following steps: under the condition of stirring, respectively preparing water soluble metal salts and water soluble metal cyanide salts into a reverse microemulsion; under the condition of stirring, dropwise adding and mixing the two reverse microemulsions so as to generate a precipitate; and separating the precipitate, cleaning the obtained product by using an aqueous solution of an organic solvent, and drying the obtained product so as to obtain the bi-metal cyanide catalyst. The catalyst prepared by using the method disclosed by the invention has the advantages that the yield is high, the average aperture is large, a multistage porous structure with certain middle holes and large holes is formed, and in a reaction process of synthesizing poly (propylene carbonate) polyols through catalytic copolymerization of carbon dioxide and propylene oxide, the improvement of the mass transfer of reactants and reaction products on the surface of the catalyst and the heat transfer in a process of high exothermic reaction is facilitated.

Description

technical field [0001] The invention relates to a method for preparing a double metal cyanide (DMC) catalyst and the application of the catalyst. The catalyst is mainly used for the copolymerization of carbon dioxide and propylene oxide to form polypropylene carbonate polyol. Background technique [0002] Polyurethane material is an important synthetic material with a wide range of properties, a wide variety of products and a wide range of uses. Generally, it is prepared by reacting polyols with polyisocyanates, and the commonly used polyols are polyether polyols and polyester polyols. The aliphatic polycarbonate polyol molecules used to synthesize polyurethane materials are mainly composed of aliphatic alkylene and carbonate-based repeating units, which are quite different from traditional polycarbonate materials, and are different from aliphatic polyester polyols and polyethers. Polyols are similar. Compared with general-purpose polyether-type and polyester-type polyuret...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/26B01J35/10C08G64/34
Inventor 程瑞华陈海波尤星辰黎源张晨刘瑞阳刘柏平孙玉成
Owner WANHUA CHEM GRP CO LTD
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